Cyclic cosmology in modified gravity

Petar Pavlovic and Marko Sossich
Phys. Rev. D 95, 103519 – Published 31 May 2017

Abstract

In this work we propose a new general model of the eternal cyclic Universe. We start from the assumption that quantum gravity corrections can be effectively accounted by the addition of higher order curvature terms in the Lagrangian density for gravity. It is also taken into account that coefficients associated with these curvature corrections will in general be dependent on a curvature regime. We therefore assume no new ingredients, such as extra dimensions, new scalar fields, phantom energy or special space-time geometries. Evolution of the Universe in this framework is studied and general properties of each phase of the cycle—cosmological bounce, low curvature (ΛCDM) phase, destruction of bounded systems and contracting phase—are analyzed in detail. Focusing on some simple special cases, we obtain analytical and numerical solutions for each phase confirming our analysis.

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  • Received 31 January 2017

DOI:https://doi.org/10.1103/PhysRevD.95.103519

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & Astrophysics

Authors & Affiliations

Petar Pavlovic1,* and Marko Sossich2,†

  • 1Institut für Theoretische Physik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
  • 2University of Zagreb, Faculty of Electrical Engineering and Computing, Department of Physics, Unska 3, 10 000 Zagreb, Croatia

  • *petar.pavlovic@desy.de
  • marko.sossich@fer.hr

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Vol. 95, Iss. 10 — 15 May 2017

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